package com.webserver.core;

import com.webserver.http.HttpRequest;

import java.io.*;
import java.net.Socket;
import java.util.HashMap;
import java.util.Map;

/*
* 处理与指定客户端的HTTP交互
* HTTP交互采取一问一答，因此这里分为三步完成一次交互过程：
* 1.解析请求
* 2.处理请求
* 3.响应客户端
* */
public class ClientHandler implements Runnable{
    private Socket socket;
    public ClientHandler(Socket socket){
        this.socket = socket;
    }
    @Override
    public void run() {
        try {
            /* 1.解析请求*/
            HttpRequest request = new HttpRequest(socket);
            /*2.处理请求*/
            String path = request.getUrl();
            File file = new File("./webapps"+path);
            OutputStream out = socket.getOutputStream();
            String line;

            //3.1发送状态行
            if(file.exists() && file.isFile()) {
                line = "HTTP/1.1 200 OK";
            }else {
                line = "HTTP/1.1 404 NotFound";
                file = new File("./webapps/root/404.html");
                }
                    byte []data = line.getBytes("ISO8859-1");
                    out.write(data);
                    out.write(13);
                    out.write(10);
                    //3.2。发送响应头
                    line = "Content-Type: text/html";
                    data = line.getBytes("ISO8859-1");
                    out.write(data);
                    out.write(13);
                    out.write(10);
                    line = "Content-Length: "+file.length();
                    data = line.getBytes("ISO8859-1");
                    out.write(data);
                    out.write(13);
                    out.write(10);
                    //单独发送CRLF表示响应头发送完毕
                    out.write(13);
                    out.write(10);

            /*3.发送响应*/

            /*
            * 发送一个标准响应头，大致如下
            * HTTP/1.1 200 OK(CRLF)
            * Content-Type: text/html(CRLF)
            * Content-Length: 2546(CRLF)(CRLF)
            * 1010101010111
            * */

            //3.3发送正文（index页面内容）
            FileInputStream fis = new FileInputStream(file);
            byte[]buf = new byte[1024*8];
            int len;
            while ((len = fis.read(buf))!=-1){
                out.write(buf,0,len);
            }

        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                //交互完毕后和客户端断开连接
                socket.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

}
